ARM: dts: imx: add Boundary Devices Nitrogen6_SOM2 support

SoM based on i.MX6 Quad with 1GB of DDR3.

https://boundarydevices.com/product/nit6x-som-v2/

Signed-off-by: Gary Bisson <gary.bisson@boundarydevices.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
index 37630f9..5363b99 100644
--- a/arch/arm/boot/dts/Makefile
+++ b/arch/arm/boot/dts/Makefile
@@ -388,6 +388,7 @@
 	imx6q-marsboard.dtb \
 	imx6q-nitrogen6x.dtb \
 	imx6q-nitrogen6_max.dtb \
+	imx6q-nitrogen6_som2.dtb \
 	imx6q-novena.dtb \
 	imx6q-phytec-pbab01.dtb \
 	imx6q-rex-pro.dtb \